Faculty of Civil and Geodetic Engineering, Ljubljana (FGGLJ)
13.
Risk-targeted force-based design and performance check by means of nonlinear analysis [Elektronski vir]
Žižmond, Jure ; Dolšek, Matjaž
The derivation of risk-targeted seismic intensity for the force-based design of structures is presented with emphasis on the target collapse risk and the closed form solution, which provides an ...insight into the risk-targeted seismic intensity. The latter is expressed as a function of the target collapse risk, the parameters of seismic hazard, the uncertainty of the seismic response, the ability of the structure to deform in the range near to collapse and the overstrength factor. The calculation of risk-targeted peak ground acceleration for force-based design is then demonstrated by means of an example of an 8- storey reinforced concrete building. The structure is designed and its performance is checked by relatively simple nonlinear analysis which confirmed the adequacy of the assumptions made in the proposed design. The proposed design is a simple extension of current state of practice but it allows design for explicitly defined target collapse risk. Definition of a risk-targeted seismic intensity for the force-based design of structures may help engineering practitioners and scholars to better understand the concept of the reduction of seismic forces for the design of structures when using linear elastic analysis.
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